gas/config/tc-arm.h

   1 /* This file is tc-arm.h
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2006, 2007, 2008, 2009, 2012  Free Software Foundation, Inc.
   4    Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
   5         Modified by David Taylor (dtaylor@armltd.co.uk)
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #define TC_ARM 1
  25
  26 #ifndef TARGET_BYTES_BIG_ENDIAN
  27 #define TARGET_BYTES_BIG_ENDIAN 0
  28 #endif
  29
  30 #define WORKING_DOT_WORD
  31
  32 #define COFF_MAGIC      ARMMAGIC
  33 #define TARGET_ARCH     bfd_arch_arm
  34
  35 #define DIFF_EXPR_OK
  36
  37 #ifdef  LITTLE_ENDIAN
  38 #undef  LITTLE_ENDIAN
  39 #endif
  40
  41 #ifdef  BIG_ENDIAN
  42 #undef  BIG_ENDIAN
  43 #endif
  44
  45 #define LITTLE_ENDIAN   1234
  46 #define BIG_ENDIAN      4321
  47
  48 struct fix;
  49
  50 #if defined OBJ_AOUT
  51 # if defined TE_RISCIX
  52 #  define TARGET_FORMAT "a.out-riscix"
  53 # elif defined TE_LINUX
  54 #  define ARM_BI_ENDIAN
  55 #  define TARGET_FORMAT "a.out-arm-linux"
  56 # elif defined TE_NetBSD
  57 #  define TARGET_FORMAT "a.out-arm-netbsd"
  58 # else
  59 #  define ARM_BI_ENDIAN
  60 #  define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little")
  61 # endif
  62 #elif defined OBJ_AIF
  63 # define TARGET_FORMAT "aif"
  64 #elif defined OBJ_COFF
  65 # define ARM_BI_ENDIAN
  66 # if defined TE_PE
  67 #  if defined TE_EPOC
  68 #   define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little")
  69 #  elif defined TE_WINCE
  70 #   define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little")
  71 #  else
  72 #   define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
  73 #  endif
  74 # else
  75 #  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
  76 # endif
  77 #elif defined OBJ_ELF
  78 # define ARM_BI_ENDIAN
  79 # define TARGET_FORMAT  elf32_arm_target_format ()
  80 #endif
  81
  82 /* We support double slash line-comments for compatibility with the ARM AArch64 Assembler.  */
  83 #define DOUBLESLASH_LINE_COMMENTS
  84
  85 #define tc_symbol_chars arm_symbol_chars
  86 extern const char arm_symbol_chars[];
  87
  88 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
  89
  90 extern unsigned int arm_frag_max_var (struct frag *);
  91 #define md_frag_max_var arm_frag_max_var
  92
  93 #define md_relax_frag(segment, fragp, stretch) \
  94   arm_relax_frag (segment, fragp, stretch)
  95 extern int arm_relax_frag (asection *, struct frag *, long);
  96
  97 #define md_optimize_expr(l,o,r)         arm_optimize_expr (l, o, r)
  98 extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
  99
 100 #define md_cleanup() arm_cleanup ()
 101
 102 #define md_start_line_hook() arm_start_line_hook ()
 103
 104 #define tc_frob_label(S) arm_frob_label (S)
 105
 106 /* We also need to mark assembler created symbols:  */
 107 #define tc_frob_fake_label(S) arm_frob_label (S)
 108
 109 #ifdef OBJ_ELF
 110 #define md_end arm_md_end
 111 extern void arm_md_end (void);
 112 bfd_boolean arm_is_eabi (void);
 113 #endif
 114
 115 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
 116    deliberately not been updated to mark assembler created stabs
 117    symbols as Thumb.  */
 118
 119 #define TC_FIX_TYPE int
 120 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
 121
 122 /* We need to keep some local information on symbols.  */
 123
 124 #define TC_SYMFIELD_TYPE        unsigned int
 125 #define ARM_GET_FLAG(s)         (*symbol_get_tc (s))
 126 #define ARM_SET_FLAG(s,v)       (*symbol_get_tc (s) |= (v))
 127 #define ARM_RESET_FLAG(s,v)     (*symbol_get_tc (s) &= ~(v))
 128
 129 #define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
 130 #define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
 131 #define THUMB_FLAG_FUNC         (1 << 2)        /* The symbol is attached to the start of a Thumb function.  */
 132
 133 #define ARM_IS_THUMB(s)         (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
 134 #define ARM_IS_INTERWORK(s)     (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
 135
 136 #ifdef OBJ_ELF
 137
 138 /* For ELF objects THUMB_IS_FUNC is inferred from
 139    ARM_IS_THUMB and the function type.  */
 140 #define THUMB_IS_FUNC(s)                                        \
 141   ((s) != NULL                                                  \
 142    && ((arm_is_eabi ()                                          \
 143         && (ARM_IS_THUMB (s))                                   \
 144         && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))       \
 145        || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)))
 146
 147 #define ARM_IS_FUNC(s)                                  \
 148   (((s) != NULL                                         \
 149     && arm_is_eabi ()                                   \
 150     && !(ARM_IS_THUMB (s))                              \
 151     /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */    \
 152     && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
 153
 154
 155 #else
 156
 157 #define THUMB_IS_FUNC(s)        ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
 158 #define ARM_IS_FUNC(s)          (!THUMB_IS_FUNC (s) \
 159                                  && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
 160 #endif
 161
 162 #define ARM_SET_THUMB(s,t)      ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB)     : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
 163 #define ARM_SET_INTERWORK(s,t)  ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
 164 #define THUMB_SET_FUNC(s,t)     ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC)    : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
 165
 166 void arm_copy_symbol_attributes (symbolS *, symbolS *);
 167
 168 #ifndef TC_COPY_SYMBOL_ATTRIBUTES
 169 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 170   (arm_copy_symbol_attributes (DEST, SRC))
 171 #endif
 172
 173 #define TC_START_LABEL(C,S,STR)            (C == ':' || (C == '/' && arm_data_in_code ()))
 174 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
 175 #define obj_adjust_symtab()              arm_adjust_symtab ()
 176
 177 #define LISTING_HEADER "ARM GAS "
 178
 179 #define OPTIONAL_REGISTER_PREFIX '%'
 180
 181 #define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
 182 #define LOCAL_LABELS_FB    1
 183
 184 /* This expression evaluates to true if the relocation is for a local
 185    object for which we still want to do the relocation at runtime.
 186    False if we are willing to perform this relocation while building
 187    the .o file.  GOTOFF does not need to be checked here because it is
 188    not pcrel.  I am not sure if some of the others are ever used with
 189    pcrel, but it is easier to be safe than sorry.  */
 190
 191 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 192   (!(FIX)->fx_pcrel                                     \
 193    || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
 194    || (FIX)->fx_r_type == BFD_RELOC_32                  \
 195    || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy))  \
 196    || TC_FORCE_RELOCATION (FIX))
 197
 198 /* Force output of R_ARM_REL32 relocations against thumb function symbols.
 199    This is needed to ensure the low bit is handled correctly.  */
 200 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)  \
 201   (THUMB_IS_FUNC ((FIX)->fx_addsy)              \
 202    || !SEG_NORMAL (SEG))
 203
 204 #define TC_FORCE_RELOCATION_ABS(FIX)                    \
 205   (((FIX)->fx_pcrel                                     \
 206     && (FIX)->fx_r_type != BFD_RELOC_32                 \
 207     && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32)         \
 208    || TC_FORCE_RELOCATION(FIX))
 209
 210 #define TC_CONS_FIX_NEW cons_fix_new_arm
 211
 212 #define MAX_MEM_ALIGNMENT_BYTES    6
 213 #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
 214
 215 /* For frags in code sections we need to record whether they contain
 216    ARM code or THUMB code.  This is that if they have to be aligned,
 217    they can contain the correct type of no-op instruction.  */
 218 struct arm_frag_type
 219 {
 220   int thumb_mode;
 221 #ifdef OBJ_ELF
 222   /* If there is a mapping symbol at offset 0 in this frag,
 223      it will be saved in FIRST_MAP.  If there are any mapping
 224      symbols in this frag, the last one will be saved in
 225      LAST_MAP.  */
 226   symbolS *first_map, *last_map;
 227 #endif
 228 };
 229
 230 #define TC_FRAG_TYPE            struct arm_frag_type
 231 /* NOTE: max_chars is a local variable from frag_var / frag_variant.  */
 232 #define TC_FRAG_INIT(fragp)     arm_init_frag (fragp, max_chars)
 233 #define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
 234
 235 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 236   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 237     {                                                                           \
 238       arm_frag_align_code (N, MAX);                                             \
 239       goto LABEL;                                                               \
 240     }
 241
 242 #define DWARF2_LINE_MIN_INSN_LENGTH     2
 243
 244 /* The lr register is r14.  */
 245 #define DWARF2_DEFAULT_RETURN_COLUMN  14
 246
 247 /* Registers are generally saved at negative offsets to the CFA.  */
 248 #define DWARF2_CIE_DATA_ALIGNMENT     (-4)
 249
 250 /* State variables for IT block handling.  */
 251 enum it_state
 252 {
 253   OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK
 254 };
 255 struct current_it
 256 {
 257   int mask;
 258   enum it_state state;
 259   int cc;
 260   int block_length;
 261   char *insn;
 262   int state_handled;
 263   int warn_deprecated;
 264   int insn_cond;
 265 };
 266
 267 #ifdef OBJ_ELF
 268 # define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
 269 # define md_elf_section_change_hook()   arm_elf_change_section ()
 270 # define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
 271 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 272 # define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
 273
 274 /* This is not really an alignment operation, but it's something we
 275    need to do at the same time: whenever we are figuring out the
 276    alignment for data, we should check whether a $d symbol is
 277    necessary.  */
 278 # define md_cons_align(nbytes)          mapping_state (MAP_DATA)
 279
 280 enum mstate
 281 {
 282   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 283   MAP_DATA,
 284   MAP_ARM,
 285   MAP_THUMB
 286 };
 287
 288 void mapping_state (enum mstate);
 289
 290 struct arm_segment_info_type
 291 {
 292   enum mstate mapstate;
 293
 294   /* Bit N indicates that an R_ARM_NONE relocation has been output for
 295      __aeabi_unwind_cpp_prN already if set. This enables dependencies to be
 296      emitted only once per section, to save unnecessary bloat.  */
 297   unsigned int marked_pr_dependency;
 298
 299   struct current_it current_it;
 300 };
 301
 302 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 303 #define TARGET_USE_CFIPOP              1
 304
 305 /* CFI hooks.  */
 306 #define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
 307 #define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
 308
 309 #else /* Not OBJ_ELF.  */
 310 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 311 #endif
 312
 313 #if defined OBJ_ELF || defined OBJ_COFF
 314
 315 # define EXTERN_FORCE_RELOC                     1
 316 # define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
 317 #endif
 318
 319 #ifdef OBJ_ELF
 320 /* Values passed to md_apply_fix don't include the symbol value.  */
 321 # define MD_APPLY_SYM_VALUE(FIX)                arm_apply_sym_value (FIX)
 322 #endif
 323
 324 #ifdef OBJ_COFF
 325 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
 326 /* Values passed to md_apply_fix don't include the symbol value.  */
 327 # define MD_APPLY_SYM_VALUE(FIX)                0
 328 #endif
 329
 330 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 331
 332 extern long md_pcrel_from_section (struct fix *, segT);
 333 extern void arm_frag_align_code (int, int);
 334 extern void arm_validate_fix (struct fix *);
 335 extern const char * elf32_arm_target_format (void);
 336 extern void arm_elf_change_section (void);
 337 extern int arm_force_relocation (struct fix *);
 338 extern void arm_cleanup (void);
 339 extern void arm_start_line_hook (void);
 340 extern void arm_frob_label (symbolS *);
 341 extern int arm_data_in_code (void);
 342 extern char * arm_canonicalize_symbol_name (char *);
 343 extern void arm_adjust_symtab (void);
 344 extern void armelf_frob_symbol (symbolS *, int *);
 345 extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
 346 extern void arm_init_frag (struct frag *, int);
 347 extern void arm_handle_align (struct frag *);
 348 extern bfd_boolean arm_fix_adjustable (struct fix *);
 349 extern int arm_elf_section_type (const char *, size_t);
 350 extern int tc_arm_regname_to_dw2regnum (char *regname);
 351 extern void tc_arm_frame_initial_instructions (void);
 352
 353 #ifdef TE_PE
 354
 355 #define O_secrel O_md1
 356
 357 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 358 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 359
 360 #endif /* TE_PE */
 361
 362 #ifdef OBJ_ELF
 363 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
 364 extern int arm_convert_symbolic_attribute (const char *);
 365 extern int arm_apply_sym_value (struct fix *);
 366 #endif